Equipment information
Hewlett Packard 427A Analog multimeter
Manufacturer:
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Model:
427A
Date:
1969
Category:
Group:
Description:
Voltmeter
Information
The Hewlett-Packard Model 427A is a versatile, compact,
self-contained voltmeter. It is capable of making de
measurements from 1 mV to 1000 volts, ac measurements from
0. 3 mV to 300 volts at frequencies from 10 Hz to 1 MHz, and
resistance measurements from 0.2 ohms to 500 megohms. With
the 01 option, the Model 427A may be powered either by a 115
or 230 volt line or by an internal 22-1/2 volt dry cell battery.
1-3, The use of solid state components throughout gives the
Model 427A both ruggedness and reliability. Battery
operation makes the instrument ideal for field use or
isolation from common mode ground loops.
Manual Type:
Service and User Manual
Pages:
48
Size:
5.33 Mbytes (5592037 Bytes)
Language:
english
Revision:
Manual-ID:
00427-90004
Date:
1970 01 01
Quality:
Scanned document, all readable.
Upload date:
2020 05 31
MD5:
a742829cdc77d91f0ca17d5f3a23d2ce
Downloads:
233
Information
Serials Prefixed: 947-
Appendix C, Manual Backdating Changes, adapts manual to serials prefixed 5 50-, 621-, 731-
Section Page
I GENERAL INFORMATION ... 1-1
1-1. Description ... 1-1
1-5. Battery ... 1-1
1-7. Instrument and Manual
Identification ... 1-1
1-10. Available Accessories ... 1-1
1-12. Cables and Adapters ... 1-1
1-13. Probes ... 1-1
Section Page
II INSTALLATION ... 2-1
2-1. Introduction ... 2-1
2-3. Initial Inspection ... 2-1
2-5. Power Requirements ... 2-1
2-7. Grounding Requirements ... 2-1
2-10. Installation ... 2-1
2-12. Bench Mounting ... 2-1
2-14. Rack Mounting ... 2-1
2-16. Combination Mounting ... 2-1
2-18. Repackaging for Shipment ... 2-1
Section Page
III OPERATING INSTRUCTIONS ... 3-1
3-1. Introduction ... 3-1
3-3. Front and Rear Panel
Description ... 3-1
3-5. Operating Instructions ... 3-1
3-6. Mechanical Zero Adjustment . 3-1
3-8. Turn-On Procedure ... 3-1
3-11. DC Measurements ... 3-1
3-12. Resistance Measurements . . 3-1
3-13. AC Measurements ... 3-2
3-16. DB Measurements ... 3-2
Section Page
IV THEORY OF OPERATION ... . 4-1
4-1. General ... . 4-1
4-5. DC Operation ... . 4-1
4-7. Ohms Operation ... . 4-1
a n An A 1
4-12. Circuit Descriptions ... . 4-2
4-13. DC Amplifier (Al) ... . 4-2
4-16. DC Offset (A2) ... . 4-2
4-19. AC Metering Circuit (A2). . . . 4-3
4-23. Battery Regulator Al ... , 4-3
Section Page
V MAINTENANCE ... . 5-1
5-1. Introduction ... . 5-1
5-3. Required Equipment ... . 5-1
5-5. Performance Checks ... . 5-1
Section Page
V MAINTENANCE (Cont'd)
5-7. AC Accuracy and Frequency
Response Check ... 5-1
5-14. Resistance Accuracy Check. . 5-2
5-16. DC Accuracy ... 5-2
5-18. AC Rejection Check ... 5-3
5-20. Input Impedance Check ... 5-3
5-25. Adjustment and Calibration
Procedures ... 5-4
5-27. Cover Removal ... 5-4
5-30. Amplifier Balance and Zero
Offset Adjustment ... 5-5
5-31. Regulator Adjust ... 5-5
5-32. AC Calibration ... 5-5
5-36. Resistance Infinity Adjustment 5-6
5-38. DC Calibration ... 5-6
5-40. Alternate Performance Checks
and Calibration Procedures. . 5-6
5-42. AC Circuits ... 5-6
5-45. Resistance Circuits ... 5-6
5-47. DC Circuits ... 5-7
5-50. AC Rejection ... 5-7
5-52. Input Impedance Check . . . . 5-7
5-54. Battery Replacement ... 5-7
5-56. Troubleshooting ... 5-7
5-60. Power Supply ... 5-8
5-63. DC Amplifier ... 5-8
5-67. AC Metering Circuit ... 5-8
5-71. Adjustment of Factory Selected
Components ... 5-8
5-73. A1R19* ... 5-8
5-75. A2C2* ... 5-9
5-77. A2R14* ... 5-9
5-80. A2R16* ... 5-9
5-82. Etched Circuit Board Repair. . . 5-9
Section Page
VI CIRCUIT DIAGRAMS ... . 6-1
6-1. Introduction ... . 6-1
Section Page
vn REPLACEABLE PARTS ... . 7-1
7-1. Introduction ... . 7-1
7-4. Ordering Information ... . 7-1
7-6. Non-Listed Parts ... 7-1
Appendix
A CODE LIST OF MANUFACTURERS
B SALES AND SERVICE OFFICES
C MANUAL BACKDATING CHANGES
Manual Type:
Service and User Manual
Pages:
38
Size:
1.80 Mbytes (1882537 Bytes)
Language:
english
Revision:
Manual-ID:
00427-90004
Date:
1970 01 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 12 30
MD5:
ca34523325e050d250723e6c4205964f
Downloads:
358